[test-release.sh] Set TEST_SUITE_HOST_CC to the release testing build compiler when compiling test-suite tools.

[amyk]

Summary

The tools used by test-suite are originally configured to compile with cc by default,
and this is dictated by TEST_SUITE_HOST_CC.
However, it is possible that on some systems that the version of cc may either not be
present or it may not be able to compile the tools as it may be too old, which could be
an issue seen during release testing.

This patch updates the compiler to be the default build compiler that is used for release
testing. If no such compiler it specified, then cc will be set as the test-suite tools build
compiler by default (as it already is set under TEST_SUITE_HOST_CC).

[nemanjai]

LGTM. But maybe wait for a few days in case others have objections.

[amyk]

@tstellar Just wanted to double check with you in case you had any objections to this patch. I'd like to commit it and would also like it added to the release branch (after it's committed).

[tstellar]

This seems fine.

[amyk]

In D118357#3294942, @tstellar wrote:

This seems fine.

Thanks @tstellar. Can https://reviews.llvm.org/rG413b35cd74e42f6371641bc9dc6c707aedac82ff also be added to the release 14 branch?

llvm/utils/release/test-release.sh

function test_llvmCore() {
     if ! ( ${MAKE} -j $NumJobs $KeepGoing check-all \
         2>&1 | tee $LogDir/llvm.check-Phase$Phase-$Flavor.log ) ; then
       deferred_error $Phase $Flavor "check-all failed"
     fi
 
     if [ $do_test_suite = 'yes' ]; then
       cd $TestSuiteBuildDir
       env CC="$c_compiler" CXX="$cxx_compiler" \
-          cmake $TestSuiteSrcDir -G "$generator" -DTEST_SUITE_LIT=$Lit
+          cmake $TestSuiteSrcDir -G "$generator" -DTEST_SUITE_LIT=$Lit \
+                -DTEST_SUITE_HOST_CC=$build_compiler
 
       if ! ( ${MAKE} -j $NumJobs $KeepGoing check \
           2>&1 | tee $LogDir/llvm.check-Phase$Phase-$Flavor.log ) ; then
         deferred_error $Phase $Flavor "test suite failed"
       fi
     fi
     cd $BuildDir
 }
for Flavor in $Flavors ; do
     echo "  Build:       $Flavor"
     echo "  System Info: "
     echo "    `uname -a`"
     echo "********************************************************************************"
     echo ""
 
     c_compiler="$CC"
     cxx_compiler="$CXX"
+    build_compiler="$CC"
+    [[ -z "$build_compiler" ]] && build_compiler="cc"
     llvmCore_phase1_objdir=$BuildDir/Phase1/$Flavor/llvmCore-$Release-$RC.obj
     llvmCore_phase1_destdir=$BuildDir/Phase1/$Flavor/llvmCore-$Release-$RC.install
 
     llvmCore_phase2_objdir=$BuildDir/Phase2/$Flavor/llvmCore-$Release-$RC.obj
     llvmCore_phase2_destdir=$BuildDir/Phase2/$Flavor/llvmCore-$Release-$RC.install
 
     llvmCore_phase3_objdir=$BuildDir/Phase3/$Flavor/llvmCore-$Release-$RC.obj
     llvmCore_phase3_destdir=$BuildDir/Phase3/$Flavor/llvmCore-$Release-$RC.install